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1   /**
2    * Logback: the generic, reliable, fast and flexible logging framework.
3    * 
4    * Copyright (C) 2000-2008, QOS.ch
5    * 
6    * This library is free software, you can redistribute it and/or modify it under
7    * the terms of the GNU Lesser General Public License as published by the Free
8    * Software Foundation.
9    */
10  
11  package ch.qos.logback.classic.joran.action;
12  
13  import org.xml.sax.Attributes;
14  
15  import ch.qos.logback.classic.Level;
16  import ch.qos.logback.classic.Logger;
17  import ch.qos.logback.classic.LoggerContext;
18  import ch.qos.logback.core.joran.action.Action;
19  import ch.qos.logback.core.joran.action.ActionConst;
20  import ch.qos.logback.core.joran.spi.InterpretationContext;
21  import ch.qos.logback.core.util.OptionHelper;
22  
23  /**
24   * Action which handles <logger> elements in configuration files.
25   * 
26   * @author Ceki Gulcu
27   */
28  public class LoggerAction extends Action {
29    public static final String LEVEL_ATTRIBUTE = "level";
30  
31    boolean inError = false;
32    Logger logger;
33    public void begin(InterpretationContext ec, String name, Attributes attributes) {
34      // Let us forget about previous errors (in this object)
35      inError = false;
36      logger = null;
37      
38      LoggerContext loggerContext = (LoggerContext) this.context;
39  
40      String loggerName = attributes.getValue(NAME_ATTRIBUTE);
41  
42      if (OptionHelper.isEmpty(loggerName)) {
43        inError = true;
44        String aroundLine = getLineColStr(ec);
45        String errorMsg = "No 'name' attribute in element " + name + ", around " +aroundLine;
46        addError(errorMsg);
47        return;
48      }
49  
50      logger = loggerContext.getLogger(loggerName);
51  
52      String levelStr =  ec.subst(attributes.getValue(LEVEL_ATTRIBUTE));
53      
54      if (!OptionHelper.isEmpty(levelStr)) {
55        if (ActionConst.INHERITED.equalsIgnoreCase(levelStr)
56            || ActionConst.NULL.equalsIgnoreCase(levelStr)) {
57          addInfo("Setting level of logger [" + loggerName
58              + "] to null, i.e. INHERITED");
59          logger.setLevel(null);
60        } else {
61          Level level = Level.toLevel(levelStr);
62          addInfo("Setting level of logger [" + loggerName + "] to " + level);
63          logger.setLevel(level);
64        }
65      }
66  
67      if (!OptionHelper.isEmpty(ActionConst.ADDITIVITY_ATTRIBUTE)) {
68        boolean additive = OptionHelper.toBoolean(attributes
69            .getValue(ActionConst.ADDITIVITY_ATTRIBUTE), true);
70        addInfo("Setting additivity of logger [" + loggerName + "] to "
71            + additive);
72        logger.setAdditive(additive);
73      }
74      ec.pushObject(logger);
75    }
76  
77    public void end(InterpretationContext ec, String e) {
78      if (inError) {
79        return;
80      }
81      Object o = ec.peekObject();
82      if (o != logger) {
83        addWarn("The object on the top the of the stack is not "+logger+" pushed earlier");
84        addWarn("It is: " + o);
85      } else {
86        ec.popObject();
87      }
88    }
89  
90    public void finish(InterpretationContext ec) {
91    }
92  }